1. upgrade to svn-1586 on http://nightlies.mt-daapd.org, as that fixes some windows stuff regarding mapping drive letters to unc paths and vice versa
As you’re using an Infrant ReadyNAS you’ll have to use the beta firmware if you want the 1586 version of firefly. To make things easier, it’s already built in.
If you’re using version 3 firmware on the NAS then you don’t have root access so you’re stuck with the Firefly 1.0 addon provided by Infrant.